Improvement in springs



w. KR'OEGER'.

Spring.

Patented July 7, 1868;

ZZZ 22W d ZIE-sb SYMW VA j ll/4% N.FETERS, FHOTO-L THOGRAPHER WASHINGTON D C WILLIAM -KROEGER, OF ALLEGHENY CITY, PENNSYLVANIA.

Letters Patent No; 79,578, dated July "7, 1868; antedateol Jime 24,1868.

IMPROVEMENT INv SPRINGS.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, WILLIAM KROEGE R, of the city and county of Allegheny, in th'eState of Pennsylvania, have invented a new and useful Improvement in Springs; and Iido hereby declare that the following is a full and exact description thereof, reference being had to theaccompanying drawings, and to the letters of reference marked thereon.

The nature of my invention consists in constructing, for carriages and other vehicles, a spring consisting of a flat-bar of steel, the ends of which are weldedtogetli'erand formed into two equal arcs of equal circles, connected at their extremities by two parallels, which will approach each other under pressure, and cause the A arcs of the circles to approach nearer to whole circles, inthe manner and for the purpose hereinafter described.

To enable others skilled in the art to makeand use my invention, I-will proceed. to describe its construction and operation.

In the accompanying drawings, which form part of my specification- Figure 1 is a top view of my improvementin springs for carriages, &c.

Figure 2 is a longitudinal section of thesame.

In the drawings, Cand C are two equal arcs of two equal circles, D nndD being their centres. The

extremities o of the arcs C and C are connected to two parallels, a; and :c. To the parallel, m,is attached the cross-bar A, on which the body of the carriage is to rest. To the parallel, as, is attached a cross-bar, B, which is to rest on the running-gear of the carriage or other vehicle.

As the construction of my improved spring will be readily understoad by the skillful mechanic, by reference to the accompanying drawings and the/foregoing description, I will therefore, without further description of its construction, proceed to describe its operation, which is as follows:

The weight of the carriage-body and its load presses down on the cross-bar A, which will bring the weight on the parallel, w, and cause it to approach the parallel, x, which will cause the extremities o of the arcs G and C to approach each other, as indicated by the dotted lines e, forming nearer whole circles of less diameter, the spring always expanding and contracting the arcs G and C in the form of true circles.

Theadvantages of my improvement in springs consist, in being enabled to make a very light, strong, and durable spring for carriages and other vehicles, at a very low price. 7

Having thus described the nature, construction, and operation of my improvement, what I claim as of my invention is- A spring, constructed and operating substantially as herein described, and for the purpose set forth.

' WM. KROEGER.

Witnesses:

A. G. Jonnsron, JAMES J. Jounsros. 

